NCLEX Review Guide: Central Nervous System Stimulants

Mechanism of Action

• CNS stimulants increase activity of neurotransmitters (dopamine, norepinephrine, serotonin) in the brain, enhancing alertness, attention, and energy levels.
• They work by blocking reuptake of neurotransmitters or increasing their release at synaptic terminals, leading to prolonged stimulation of neural pathways.

Amphetamines

• Dextroamphetamine (Dexedrine), Amphetamine/dextroamphetamine (Adderall) are first-line treatments for ADHD with duration of 4-6 hours for immediate-release formulations.
• Extended-release formulations provide 8-12 hours of symptom control, allowing once-daily dosing for improved medication adherence.

Methylphenidate Derivatives

• Methylphenidate (Ritalin, Concerta) has lower abuse potential than amphetamines and is often preferred for pediatric patients with ADHD.
• Available in multiple formulations: immediate-release (3-4 hours), sustained-release (6-8 hours), and extended-release (10-12 hours).

Non-Stimulant Alternatives

• Modafinil (Provigil) promotes wakefulness in narcolepsy with less cardiovascular risk compared to traditional stimulants.
• Atomoxetine (Strattera) is a selective norepinephrine reuptake inhibitor used for ADHD when stimulants are contraindicated.

Assessment Priorities

1. Monitor baseline vital signs, especially blood pressure and heart rate, as stimulants can cause cardiovascular effects
2. Assess growth parameters in pediatric patients, including height and weight measurements
3. Evaluate sleep patterns and appetite changes before and during treatment
4. Screen for history of substance abuse, cardiac conditions, or psychiatric disorders

Administration Guidelines

• Administer early in the day to prevent insomnia, typically before 6 PM for immediate-release formulations.
• Give with or after meals to minimize gastrointestinal upset and appetite suppression effects.
• Extended-release tablets should never be crushed, chewed, or divided as this destroys the controlled-release mechanism.

Common Side Effects

Essential Teaching Points

• Take medication exactly as prescribed and never share with others due to high abuse potential and legal consequences.
• Report any chest pain, shortness of breath, or fainting episodes immediately as these may indicate serious cardiovascular effects.
• Maintain regular follow-up appointments for monitoring growth, vital signs, and therapeutic effectiveness.
• Avoid caffeine and other stimulants to prevent additive effects and increased risk of adverse reactions.